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A Review of Block Truncation Coding Using Digital Halftoning

Riyaz Ahmad Dar

Images are an important part of today's digital world. However, due to the large quantity of data is needed to represent modern imagery; the storage of such data can be expensive. Thus, the work on efficient image storage (image compression) has the potential to reduce storage costs and enable new applications. Block Truncation Coding (BTC) is a lossy image compression technique which uses moment preserving quantization method for compressing digital grayscale images. Even though this method retains the visual quality of the reconstructed image with good compression ratio, it shows some artifacts like blocking effect and false contouring. In this paper, various schemes of block truncation coding using digital halftoning proposed to improve the quality of BTC will be discussed.